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We now know megaphages (phages with extremely large genomes) are ubiquitous, but before now, no complete marine megaphage had been identified. Slawomir Michniewski (University of Warwick) and colleagues published a new paper in ISME Communications showing a new family of “megaphages” abundant in the marine environment. They assembled >900 draft viral genomes from English Channel water, one of which encoded a novel 650-kB megaphage, making it one of the largest phage genomes assembled to date.